This is probably a wacky idea, but has anyone ever tried putting the queen and brood on top of the stack over an excluder during the flow? You would have to move the brood boxes off to add empty supers, but it sure would make it easier to check for swarm cells - until the stack got tall that is. But by then your honey crop is made anyway. Either way you have to pull supers to do an inspection, this way it would just be the brood supers.
I suspect that it might cause some kind of problem like really excessive backfilling, but maybe not. Anyone ever tried it?
I'm going to try the inspect for cells every 7-10 days method on a few hives, and already I'm trying to think of a lazy way.